[ Vocabulary ]
Experts say that the _______ of the world could be over 7 billion by the year 2015.
A. number
B. population
C. rate
D. quantity

Random Topics:
Modal Verbs for PossibilityPassive of Modal VerbsActive & PassiveFuture Time and TensesPast TensePast TensesLinking Verbs and TensesSubject/Verb Agreement with Collective NounsGerund after Prepositions and Certain VerbsComparative AdverbOther quiz:
Tenses › ViewWhen we got to the airport, our plane _______.
A. had left
B. leave
Grammar and Vocabulary › View
What are you doing? I’m looking … my phone. I can’t find it.
A. at
B. on
C. for
D. after
Relative Clauses and etc › ViewIn a big city like New York, __________ Jodie lives, it isn’t easy to meet people.
A. where
B. which
C. that
D. when
Grammar › View
We … In this restaurant 2 days ago
A. Ate
B. Eaten
C. Eating
D. Eat
